Video of the assault at the Interfaith Homes apartment complex shows the woman on the ground being repeatedly punched and kicked in the head. It was posted on Facebook on Monday and forwarded to police, who viewed the video Wednesday, Capt. Jim Mallery said.

"It's extremely disturbing," Mallery said of the 80-second video.

Mallery said the assault occurred at about 9:10 p.m. Monday and was reported to Public Safety officers who were already at Interfaith Homes that night for a report of gunshots being fired. Police responded to a second report of gunshots being fired at midnight, he said.

Officers on Monday night were unable to speak to the woman, who was taken to Bronson Methodist Hospital for treatment of injuries that included a cut to the head, Mallery said. Officers followed up with the woman Tuesday and she was able to provide physical descriptions of her assailants.

Mallery said police believe the video "will be instrumental" in identifying suspects. He said the video, which shows the suspects punching, kicking and, at one point, stomping on the back of the woman's head, was forwarded to him after someone shared it Tuesday on a KDPS recruitment Facebook page.

Mallery, who is in charge of Public Safety's patrol division, said he viewed the video with his lieutenants and sergeants and developed a plan that, among other things, calls for officers to do directed patrols "every hour" in the area of Interfaith Homes, located near the city softball fields on Kalamazoo's northwest side. "We haven't determined when the directed patrols will stop," he said.

Mallery also said command officers for Public Safety's C.O.P.S. division– Capt. Dave Boysen and Sgt. Matt Elzinga – were "putting an action plan together to assist" patrol officers.

Mallery said police are asking that anyone who may know the victim of the assault or who can identify the suspects call KDPS at 269-337-8994, or contact Silent Observer at 269-343-2100 or www.kalamazoosilentobserver.com.

Rex Hall Jr. is a public safety reporter for the Kalamazoo Gazette. You can reach him at rhall2@mlive.com. Follow him on Twitter.